I．单项选择（共15小题，计15分）
1. the morning of June 23, 1990,we started out for the city the east of China.
A. In, in B. In, on C. On, on D. On, in
2. It’s sixty kilometers ______ here to the school.
A. away from B. far away from C. away D. far
3. We must do something to stop people from ______.
A. to throw litter about B. to throw litter into
C. throwing litter about D. throwing litter into
